Final answer:
Kant would say the shopkeeper's action was in accordance with duty, but not done from duty, as it was motivated by self-interest for business success rather than by a sense of moral duty.
Step-by-step explanation:
The action of the shopkeeper who is honest for business reasons aligns with the idea of a hypothetical imperative in Immanuel Kant's ethical theory. Unlike the categorical imperative, which dictates actions are moral if they are done from a sense of duty, the hypothetical imperative is related to achieving a specific goal. In this case that goal is the success of the shopkeeper's business.
Therefore, Kant would say this action b. was in accordance with duty, but not done from duty. The action lacks moral worth because it was not motivated by duty, but rather by self-interest, even though the outcome (honest behavior) appears to be in line with what is considered morally correct.